Verilink AS2000: The Basics (880-502981-001) Product Manual - Manual (Page 126)

Acronyms and Definitions
Glossary-6 Verilink Access System 2000: Basics
bit error rate (BER) The ratio of received bit errors to
the total number of bits received.
The time over which this rate is
calculated is not inherent to the
definition and can be separately
specified. For low error rates, the
cyclic redundancy check (CRC)
can be used to estimate the bit
error rate (BER) , assuming that
not more than one error will occur
per Extended Superframe
Format (ESF) .
bit error rate seconds (BERS) A count of one-second intervals in
which a bit error rate alarm
existed.
bit error rate threshold A bit error rate (BER) level above
which a CSU alarm is generated
and reported to the management
software.
bit-oriented A communications protocol or
method where control information
(for example, framing and
signaling) is encoded in fields of
one or more bits. This procedure
is distinct from byte-oriented
protocols, which require more
space (an entire byte at a time)
devoted to control and overhead.
Bit-oriented protocol is used in the
digital signal facility data link.
bit stuffing A data stream used to adjust the
different incoming rates of seven
DS2 signals before multiplexing
into the DS3 rate. The DS2 signals
can be asynchronous relative to
each other (because they may have
not been formed within a common
multiplexer) and therefore may be
operating at different rates.
bit/s Bits per second; a basic unit of
measure for serial data
transmission. High transmission
rates are given in kbit/s (kilobytes
per second) measuring thousands
of bits per second; or Mbit/s,
measuring millions of bits per
second.
blue alarm A received alarm indication signal
of unframed all ones from the
network service provider.
bps See bit/s .
BPV See bipolar violation (BPV) .
BPV count The number of bipolar violation
(BPV) occurring over a given
period of time.